Rational Fitting with Weighted Iteration (RFWI) with Application to Band-Notched UWB Pyramidal Antenna

A novel approach, Rational Fitting with Weighted Iteration (RFWI), is presented in this paper. It has the ability to convert the concrete data in complex number field to an analytical rational function, for potential usage as a surrogate model. And an example of parameter extraction from a band-notched UWB pyramidal monopole antenna demonstrates that the RFWI approach is feasible and precise. Its flexible weighting factor can be adapted to a lot of harsh scenarios, even the precise recognition of a very narrow notched-band within an operating UWB spectrum, just as shown in this example. The surrogate model extracted through RFWI approach would be meaningful and necessary in the analysis required to further integrate the complicated antenna into a wireless communication system in the future.